I still wonder if there's no day care for elder people in Japan. Or does Seichi just don't know and won't reach for help? I think it would help him a lot to know someone takes care of her during the day and when he's away.
Anyway, I hope he gets some help soon. I forgot her name but I wonder if his former classmate shows up again after they met at the graveyard. She's the only one he ever made some connection with aside from his mother.